Dagger, meet Flows. Flows, meet Dagger.

Daggerizes all of the EPP flows. This does not change anything yet
about the flows themselves, just how they are invoked, but after
this CL it's safe to @Inject things into flow classes.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=125382478

java/google/registry/flows/domain/DomainAllocateFlow.java

@@ -48,6 +48,8 @@ import google.registry.model.registry.label.ReservationType;
 import google.registry.model.reporting.HistoryEntry;
 import google.registry.tmch.LordnTask;
 
+import javax.inject.Inject;
+
 /**
  * An EPP flow that allocates a new domain resource from a domain application.
  *
@@ -62,6 +64,8 @@ public class DomainAllocateFlow extends DomainCreateOrAllocateFlow {
   protected AllocateCreateExtension allocateCreate;
   protected DomainApplication application;
 
+  @Inject DomainAllocateFlow() {}
+
   @Override
   protected final void initDomainCreateOrAllocateFlow() {
     registerExtensions(AllocateCreateExtension.class);